Grinding machine for shear blades or the like



March 27, 1951 H. c. WHEELER GRINDING MACHINE FOR SHEAR BLADES OR THELIKE 4 Sheets-Sheet 1 Filed March 5, 1949 ATTORNE\.

HENRY E..WHEELER H. C. WHEELER 4 Sheets-Shet 2 March 27, 1951 GRINDINGMACHINE FOR SHEAR BLADES OR THE LIKE Filed March 5, 1949 R. m a I m l VL0 .IL im E w m NE E A fi II W I ll l l l I I I l l II Q u N M m m N m mNM E rv H I Em l i I Ev mi N NE m l m\ NE E ow QR .MW $l.m mfi ms h k4ME NE b Qm q& I \M Ex 5;: 0 MN MN m fi. n. Q E &N. \E 1% mm I Q 1% R. Em

Mrch 27, 1951 I H. c. WHEELER GRINDING MACHINE FOR SHEAR BLADES OR THELIKE 4 Sheets-Sheet 3 Filed March 5, 1949 wmwm INVENTOR. HENRY DWHEELERATTORN EY.

March 27, 1951 H. c. WHEELER 2,546,914

GRINDING MACHINE FOR SHEAR BLADES OR THE LIKE 4 Sheets-Sheet 4 FiledMarch 5, 1949 4 INVENTOR. HENRY [LWHEELER ATTORNEY.

Patented Mar. 27, 1951 GRINDING MACHINE FOR SHEAR BLADES OR THE LIKEHenry 0. Wheeler, Fairfield,

The Acme Shear Company,

Conn., assignor .to Bridgeport, Conn.,

a corporation of Connecticut Application March 5, 1949, Serial No.79,843

13 Claims.

The present invention relates to a grindin machine for shear blades orthe like, and has for its object to provide an automatic machine of thischaracter in which a continuous succession of shear blades or the like,placed in successively arranged carriers, are carried by an endlessconveyerinto grinding relation with one or a succession of grindingwheels, or other suitable grinding means, and whereby the grindingoperation is carried out rapidly, uniformly and with a precision-that isusually only obtained by slow hand grinding methods requiring highlskilled operators. Shear blades are ground with a helical surface, andit is particularly proposed to provide carrier means for the bladesadapted to hold them in a precisely predetermined angular relation asthey move in relation to the'grinding wheels, to produce such helicalsurface. It is further pro-' posed. to provide guide means for feedingthe bladecarriers into and out of relation to the grinding wheels, andfor maintaining them, between the points of engagement and disengagement.of the blades with respect to the grinding wheels, in a given arcuatepath of travel about the. grinding wheel peripheries.

Another object is to provide guide means for the carriers adapted toswing into and out of relationwith the grinding wheel surfaces so thatthe entire area of each blade surface to be ground is at, once broughtinto and out of engagement with the grinding wheel surface, thuspreventing the partial or edge grinding of such blade surface...

A further object is to provide carriers for the blade into which theymay be loosely placed by the operator of the machine, and havingclamping means adapted to be brought automatically into retainingrelation to the blades to hold them during the grinding operation, andto be disengaged; automatically from the blades to release them at thecompletion of the grinding operation.

With the above and other objects in view, an embodiment of the inventionis shown in the accompanying drawings, and this embodiment will behereinafter more fully described with reference thereto, and theinvention will be finally pointed out in the claims 1; In the, drawings:

Fig; 11' is a side elevation of the grinding machineiflccording to theillustrated exemplary embodiment of the invention, the same being shownpartially broken away.

Figs. 2; is a top plan view of the main frame of the machine, partiallybroken away, the grind-. inggwheels and; the conveyer for the bladecarriers being removed.

1 Fig. 9 is a vertical transverse sectional 'Fig. 3 is a verticalsectional view, on an en-. larged scale, taken along the line 3-3 ofFig. 1. Fig. 4 is a vertical sectional view, on anem larged scale, takenalong the line 4-4 of Fig. 1. Fig.5 is a plan view on a further enlargedscale of one of the blade carriers, the position of a blade-beingindicated by the dot-and-dash lines, and. the blade retaining meansbeing shown in blade gripping position.

Fig. 6 is an end view of the blade carrier..

Fig. 7 is a side elevation, partially in vertical section. Fig. 8 is aplan view showing the blade retain. lng means in blade releasingposition.

view. taken along the line 9-9 of Fig. 5, the dot-anddash linesindicating the conveyer chain con nected thereto.

Fig. 10 is a plan view of one of the nest strips employed forpositioning the blade in the care ner. Fig. 11 is a t ansverse sectionalview, taken along the line I |-ll of Fig. 10.

- Fig. 12 isa plan view of another of the nest strips for positioningthe blade in the carrier.

I Fig- 13 is a sectional view taken along the line l3-l3 of Fig. 12.Fig. 14 is a detail vertical sectional view, on a further enlargedscale, taken along the line I4-l 4 of Fig. 5. Fig. 15 is a horizontalsectional view, taken along the line l5-l5 of Fig. 14. Fig. 16 is avertical sectional view, taken along the line Iii-l6 of Fig. 5. v

Fig. 17 is a vertical sectional view taken along the line l'|-.-l'l ofFig. 5, the dot-and-dash lines indicating one of the operative positionsof the part illustrated therein. I Similar reference characters indicatecorresponding. parts throughout the several figures of the drawings.Referring to the drawings, the grinding maI-J chine, according to theillustrated exemplary embodiment of the invention, comprises a mainframe consisting. of a pair of end table supports, indicatedgenerally asH! and H, the table supportlll comprisingapair of leg members |2-l2having a bracing shaft l3 bolted between them, and having. a horizontaltable bed i4 bolted to their upper ends, a. pair of vertical bearingplates l5l5 being bolted to the table bed M. The table support II issubstantially similar to the table support In, and comprises leg membersl6-.,l.5 having a bracing shaft l1 bolted between them and having ahorizontal table bed "bolted to theirg fupper ends, a pair of verticalbearing plates IS-l9 being bolted to the table bed. A pair oflongitudinal side plates 26-26 extend between the end table supports I6and H and have their end portions rigidly secured to the inner sides ofthe bearing plates l-l5 and I9-I9 by bolts 2| and 22, a series oftransverse T-braces 23 being disposed between the side plates 26 andrigidly secured at their ends to the inner sides of the side plates,preferably by welding.

The machine of the invention contemplates the automatic feed of asuccession of shear blades into relation with one or more grindingwheels, or other suitable grinding means. The general term grinding isemployed-and intended to describe such specific operations as grinding,polishing, bufling and the like. For the present illustration there isshown a machinehaving two longitudinally spaced grinding wheels, one ofthe grinding wheels and its associated parts Ice-- ing fully shown andthe other grinding wheel and its associated parts being partially shown.It will'be understood that in the case of a single grinding wheel beingemployed theoverall length of the machine will be materially shortened;and in the case of a succession of two or more grinding wheels theoverall length will be increased as requiredto accommodate theadditional units and provide the necessary space between them. It isfurther pointed out that in providing a succession of grinding wheelsthe first grinding wheel will usually be of a type to perform apreliminary or rough grinding operation upon the blades, and thesuccessive grinding whee1s will be such as to produce intermediate andfinishing grinding operations, the complete grinding 'Of the shearblades being thus carried out in the onemachine. a r

In the bearing plates l5 of the table support In thereis journaledinsuitabl'e bearings 24 a conveyer mounting shaft, 25 ;u'p0nwhich aresecured a pair of sprocket wheels 26-26, the shaft being providedupononeflof its ends with a spur gear 2! engaged by a pinion gear 28mo'unted'up'on one end of a "counter shaft 29 journaled in suitablebearings 36-36 in the bearing plates l5, this counter shaftb'eingrprovided upon its other end with a sprocket gear 3| driventhrough a sprocket chain 32 from a sprocket wheel 33 of a power unit,indicated generally as 34, this power unit including an electric motor35, suitable reduction gearing providedin a reduction gearing housing 36and a friction clutch drive 31 betweenthe reduction gearing and thesprocket wheel 33.

In the bearing plates [9' of the table support;-

It there is mountedfor longitudinal adjustment ashaft 38 provided with apair of sprocket wheels 39-39 .inhlongitud'inai line with the sprocket;wheels 26-26, this shaft .r-being rotatably sup-'- ported at itsTends-in bearing blocks 46-40, slideably mounted for longitudinaladjustment in slideways 4I-4I provided in the respective bear i-ngplates IQ-l9, these blocks being engaged at their inner sides byadjustment screws 42-42 set the ends of the slidewaysl4l-4l andbeingfined in their positions of adjustment by lock: nuts 46- 43,turning bf the adjustment screws moving the bearing blockslongitudinally in the slideways; Two parallel endless conveyor sprock='t 44-44, in which a'series'of equally spaced blade carriers are set, aswill presently more fully 'agpeaa-a e'anried ab'outthe sprocket whens26-2 6 afid"39- 39, ;andthrough the drive a he 's-haft25 from'the owerehains are caused to travel diicated by 'tlie arrowin Fi The bladecarrier units, indicated generally as 45, each comprise a rectangularbody member 46, best illustrated in Figs. 5 to 9, provided at each ofits ends with a downwardly extending flange 47 in which a pair of rollerstuds 46-48 are secured by nuts 49-49, and upon which are mountedcylindrical rollers 56-56, one roller being provided in projectingrelation at each of the four corners of the body member 46. At theunderside of the body member substantially adjacent each of the flanges47 there are secured by rivets 5! a pair of angular brackets 52-52, eachhaving apertured ears 53-53 in which are engaged the end pins 54-54 ofthe two sections of the sprocket chain 44 connected to the bladecarrier, thespacing of the end pins 54-54 corresponding to the spacingof the other pins connecting the links of the sprocket chain, so thatthe brackets 52 in effect constitute a link of the sprocket chainadapted to be engaged by the teethof the sprocket Wheels as the bladecarrier moves about the sprocket wheels.

The upper traverse of the conveyor constitutes the working path of theblade carriers during; which they move into relation with the grindingwheels,,as will presently more fully appear, and the lower traverse ofthe conveyor constitutes the return path. In the movement of thecarrier-.-

along the upper working path the carriers are guided along the intervalsbetween the sprocket wheels and the grinding wheels and between thesuccessive grinding wheels by a series of hori zonta'l trackways at eachSide of the machine;- these trackways each consisting of a pair ofparallel rails 56 and 56 secured by screws 5'! to the inner sides of theupper end portions of .a series of vertical supporting bars 53 securedby screws 59 to the outer sides of the longitudinalside plates 26. Therails and 5'6 are YeSpeC-"i tively provided at their opposed faces withright angular channel recesses 60 and 61 in which the rollers 56 of theblade carriers are guided and having rolling engagement with the lowerree: cesses 6|, the horizontal path of movement or the blade carriers inthe trackways being tangen I tial to the sprocket wheels 26 and 39. Inthe movement of the blade carriers along the lower return path they aresupported in inverted vposition on inwardly projecting ledge bars 62-62secured upon'the lower sides of the side plates 26, 1 the rollers 56having rolling contact with these ledges. At theends of the ledge barsadjacent the sprocket wheels 26-26 there are securedtd the inner sidesof the bearing plates 15 downwardly flared ledge members 66-63 arrangedin continuation of the ledge bars for the purpose of providing a flaredentrance for engagement of the r'ollers'withth'e ledge bars. 1 I 1 Thegrinding-wheels" "B4 are mountedabove t upper traverse of theconveyer-"in suitable su'p' ports fand each grinding wheel is preferablyprovided with an individualdriving motor, in icated as 66. The grindingwheel "may if 'desi be constructed or "suitable grinding, poush'inbin-Ting" or similar material, but preferably e material i carried on anendless ban'de gaged over the wheel as a supportj'this band else. beingengaged over a suitable wheel or pulley, not showm 'spaced abovethewh'eel 64. The peripheralsurface of the grinding wheel may besuitably" contoured, as shown, for example, in Fig.3, the case ofgrinding operations requiring such contoured periphery, the flexibleband 64 readily cenforming to this contour. The grinding wheel's mayrotate in'either direction depending upon the particular placement ofthe blades in the blade carriers. In moving in relation to each of thegrinding wheels the blade carriers are guided through an arcuate pathabout the periphery of the grinding wheel, and for this purpose thereare mounted upon the side plates 2il-2U, between the spaced ends of thehorizontal trackways at each side of the grinding wheels, a pair ofchannel guide plates 61-61.

These channel guide plates are mounted for vertical adjustment upon theinner sides of the side plates 20-48, each being provided for thispurpose with a pair of longitudinally spaced lugs 68-68 projectingthrough slot openings 6969 inthe side plates, these lugs each havingfiattened upper and lower surfaces respectively engaged by verticallydisposed upper and lower adjustment-screws and 1| mounted in angularbrackets 12 and 13 secured by screws 14 to the.v

outerside of the respective side plate. Thus by adjustment'of the screwsthe channel guide plates may be vertically adjusted, and also angularlyadjusted, to bring about proper alignment with the horizontal trackwaysas well as the proper relation to the grinding wheel. The adjustedposition of each of the channel guide plates is fixedby flat head screws15-15 screwed therein and engaged in vertical slots 16-16 in therespective side plate 20, a washer 11 being disposed beneath each screwhead for binding engagement with the side plate upon tightening of thescrew.

The channel guide plates each project substan-.

tially above the upper edges of the side plates 29, and their upperprojecting portions are relatively thicker than the lower portionsengaged with the side plates, an outwardly disposed shoulder ledge 18being provided at the lower edge of the upper thickenedportions directlyabove the upper edge of the side plate and which is adapted to limit thedownward adjustment of the channel guide plate. At the inner side ofeach of the channel guide plates near its upper edge there is providedan arcuate channel groove 19 having horizontal channel grooves 80-4!!!at its ends in longitudinal alignment with the horizontal guide ways and56, the upper edge of the channel guide plate being concavely recessedin parallel relation to the channel groove 19.. These .channel groovesare thus continuous with the horizontal trackways and provide arcuatetrackways for the rollers of th'eblade carriers, so that the shearblades are successively moved in a path about the periphery of thegrinding wheel, being tilted into and out of engagement with thegrinding wheel surface as the rollers move from the horizontal to thearcuate channels. To this end the spacing of the rollers atieach side ofthe blade carrier is such that the entire surface of the shear bladetobe ground is 9.11 once brought into contact with the grinding wheel asthe forward and rearward spaced rollers both become engaged with thear-..

cuate channel grooves. and the ground surface is at, once disengagedfrom the grinding wheel through tilting the blade carrier as the forwardrollers move from the arcuate channel groove to the horizontal channelgroove. While the arcuate channel groove appears to be substantialhconcentric to the grinding wheel periphery, it is in fact slightlyeccentric, so that the space between them is slightly convergent to thusmaintaina con tantly engaged relation of the blade with thev wheel asits surface is ground and dimen sionally changed.

.zll-lee'b ade ca ier .45.: asbest .shownin. Rigs. 5..

to 17 is adapted to permit angular adjustment of angle at which theblade is held as it moves in.-

relation to the grinding wheel, andfor: this purpose there is mountedupon the flat upper side of the body member 46 a rectangular swivelplate 8i, provided with a centrally disposed hole 82 engaged by a pivotplug 33 secured in the body member it. At each end of the swivel plate8| there is provided an arcuate slot 84 concentric to the pivot plug 83and engaged by a set screw 85, the head of which is seated against acountersunk shoulder 86 of the slot. Upon loosening of the screws theswivel plate may be swung about the pivot stud B3 to any desired angularposition, within the limit of adjustment determined by the lengths ofthe slots 34, the adjusted position being} secured'by tightening the setscrews 85. w

Within a, rectangular recess 81in the upper side of the swivel platethere is secured by means of screws 88 extending upwardly from theunderside of the plate SI, a nest plate 39 for supporting the shearblade, this nest plate having secured. upon its upper side, by means ofscrews 90 extending upwardly from its under side, a pair of, side neststrips 9| and lhsuitably beveled as at. Q3 and 94, to conform to thebeveled outer side, surfaces of the shear blade, and being suitably,notched as at and 9%, to conform to the shouldered base of the shearblade adjacent its' handle portion. Asclearly shown in Figs. 5 and 6,the surface of the blade to be ground is slightly raised from the uppersurfaces of the side nest strips. The outer sides of the side neststrips, 'as well as the outer edges of the nest plate 89, and the uppersurface of the base of the recess 81,; are beveled, as at 31 and 98, sothat clearance spaces are provided at each side of the blade surface tobe ground, to thus enable the blade carrier to swing into relation withthe grinding wheel to engage the surface of the blade to be groundtherewith, without contact of any part of the blade carrier with thegrinding wheel.

The handle portion of the shear blade I is; adapted to be resilientlysupported, and for this purpose a support plate 99 is engagedinadiagonally disposed slot 106, provided in the upper side of the swivelplate 8| at its portion to the right of the recess 81, as seen in Fig.5, being resiliently mounted upon a pair of coil springs Nil-int,disposed in sockets screws Hl3ili3 screwed into the base of the sockets,the screw heads being seated in pockets lB4l 34 in the support plate.The support plate normally projects slightly above the swivel plate,

as shown in Fig. 16, and is adapted to be. de-

pressed through downward pressure applied to the handle of the shearblade. The shear blade is adapted to be firmly held by clamping means,presently to be more fully described, and the resilient support of thehandle provided by thesupport plate 99 prevents any possibility of thehandle being strained to the point where it wil fracture or bend. Italso compensates for any irregularity in the handle portion which mightotherwise prevent proper seating of the blade in the nest plate. f

The body member 46 of the blade carrier is provided at one side of thecenter and adjacent one longitudinal edge with a downwardly projectingbearing hub portion Hi5, having a cylin-.: drical bore H16 in which issecured by a force fita cylindrical bearing bushing Nil having its upperend flush with the upper side of the body member and its lower endupwardly. offset from the lower side. Upon the upper side of the bodymember lil2i 62 about shoulder.

there is secured, by means of a pin I08, a cam ring I09 having-'21cylindrical bore III'Iin register with the bore of the bearing bushingI01, and having a radially disposed cam recess IlI in its upper surface,this recess having a fiat base surface-and upwardly and outwardlybeveled end surfaces. Rotatably engaged in the bearing bushing I07 isa-vertical shaft I I2 upon the upper reduced diameter end of which thereis secured, by means of a screw H3, and a countersunk washer H4, the hubportion of a clamp member H5,- thisclamp member being fixed againstrotation upon the shaft by a diametric slot H6 in its lower side engagedby flats IIl-I I? provided on the shaft. The clamp member l I 5 includesa projecting arm portion having a convex clamp surface H8 at'itsunderside adapted in one position of the clamp member to engage the baseof the shear blade, as shown Fig. 5, and in another position to bedisengaged from the shear blade, as shown in Fig. 8.

In moving into and out of engaging relation with'the shear blade theclamp member is adapted to be lowered and raised substantiallyvertically, so that there is no appreciable wiping engagement with theshear blade. For this purpose the clamp member is provided at itsunderside with a round headed clamp raiser pin H9, set in a hole i223,this pin being normally disposed in the 6am recess III of the cam ringI39 with the under surface of the clamping member in engagement with theupper surface of the cam ring, being yieldably held in this position bya spring I'2I engaged about the lower end of the shaft H2 between theupwardly offset end of the bearing bushing H2 and the hub portion I22 ofa clamp operating lever arm I23 secured upon the lower end of the shaft.Swinging of this lever arm, as will hereinafter more fully appear, isadapted to impart swinging movement to the clamp.

As-the clamp is swung from its closed or clamping position, as seen inFigs. 5 and 14, the pin I l 8 rides up upon one of the beveled endsurfaces of the cam recess III and on to the upper surface of the camring, thus raising the clamp member, as shown in Fig. 8, this being theopen or releasing position of the clamp member. As the clamp membermoves into clamping position it remains raised from the surface of theshear blade until it is directly above it, whereupon it is lowered intoengagement with the shear blade as the pin H9 re'engages the cam recessI I i. Upon the end of the lever arm !23 there is provided a roller I24,rotatably supported upon a headed screw stud I25, secured to the leverarm by a nut I26, this roller adapted'to engage cam means provided inthe. mach ne, 'forthe purpose of automatically aper'atingthe clampmemberinto clamping and unclamping-positions, as will presently more fullyappear.

A cylindrical collar I2? is engaged about the cam ring I09, and projectsabove it to provide a dirt shield for the cam recess III and the spacebetween the clamp member and the cam ring, this collar being engagedwith a force fit upon the cam ring .and being slideably engagedby thehub portion of the clamp member. The swivel plate 8I is provided with acut-out I28 concentric to the pivot stud for clearing the clampingmechanism as the swivel plate is moved between its positions ofadjustment. A pair of stop posts I29 and I30 are secured upon theunderside of the body member 46, and are positioned to respectively abutthe lever I23 in its limit positions, as indicated respectively in Figs.5 and 8.

' being disposed in the path of travel of the clamp release the groundshear blades.

operating rollers I25 of the successive blade car: riers, the clampmembers of which are in open position at this point in their travel.This card causes the lever arm I23 andthe clamp member i I5 connectedthereto to swing into clamping engagement with the shear blade disposedin the carrier, as shown in Fig. 5;

It is pointed out that an operator of themachine feeds the shear bladesinto the carriers at a point to'the right of the closing cam, as" seen"in Fig. l. A shoe I-35'having a rounded nose L36 is mounted upon abracket arm I37 secured by bolts I38 to oneof the side plates 20, thisshoe be ing situated so that it engages the shear'b'lade in the carrieras it moves into relation'with the closing cam, to insure that it isproperly seated in the nest plates of the carrier between the side. neststrips. The shear blades are thus firmly held in the carriers as theytravel into grinding relationwith the grinding wheels.

At a suitable point along the lower traverse of the conveyer there isprovided a clamp opening cam 39, mounted upon a bracket I48 secured toone of the T-braces 23 by screws I4 I, the inclined surface I42 of thiscam being disposed in the path of travel of'the rollers I24 of the clampoperating lever arms I23 of the blade-carriers in the closed position ofthe clamp members, and is adapted'to' swing the clamp members into openposition to Asthe blade carriers 'are in inverted position as they movealong the lower traverse of the conveyer, the'released blades drop bygravity into a suitable receptacle or conveyer means for moving themaway from the machine.

I have illustrated and described a preferred and satisfactory embodimentof the invention, but it will be understood that changes may be madetherein, within thespirit and scope thereof, as defined in the appendedclaims.

What is claimed is: l

1. In a grinding machine for shear blades'or; the like, a grinding meanshaving a'circumferential peripheral grinding surface, a conveyersuitably supported and driven beneath said grind" ing means andincluding a series of successively arranged blade carriers, horizontalguide means longitudinally at each side of said grinding means forguiding said blade carriers into and out of relation therewith, andarcuate guide means in spaced relation to the'grinding surface of said'grinding'means for guiding said blade carriers in an arcuate path aboutsaid grinding surface, said blade carriers each having longitudinallyspaced front and rear guide'engaging means whereby said blade carriersare tilted as said front and rear guide engaging means aresimultaneously in engagement with said horizontal and arcuate guidemeans.

2. In a grinding machine for shear blades 'or the like, a grinding-meanshaving a circumfer-f' ential peripheral grinding surface, a conveyersuitably supported and driven beneath said grind ing means and includinga series of successively arranged blade carriers, horizontal guide meanslongitudinally at each side of said grinding means" for guiding saidblade carriers into and out '61" relation therewith, and arcuate guidemeans in spaced relation to the grinding surface of said grinding meansfor guiding said blade carriers in anarcuate path about said grindingmeans, said .Iplade'carriersjeach having longitudinally spaced front,and rear guide engaging rollers whereby said blade carriers" are tiltedas said front and rear guide. engaging rollers are simultaneously inengagement with said horizontal and arcuate guide means.

3. In a grinding machine for shear blades or the'like, a grinding'meanshaving a circumferential peripheral grinding surface, a conveyersuitably supported and driven beneath said grinding means and includinga series of successively arranged blade carriers, said blade carrierseach having-blade supporting means inits'uppe'r side, transverselyspaced horizontal-'guide'---means at each side 'tofsaidnconveyer andlongitudinally at each side of said grinding, means for guiding saidblade carriers into and out of relation therewith,

and transversely spaced arcuate guide means at each'side ofsaid'conveyer inspaced relation to the grinding surface of said grindingmeans for guiding said blade carriers in van arcuate path about saidgrinding surface, said blade'carriers each having longitudinally spacedfront and rear spaced guide engaging means at each side whereby saidbladecarriers are tilted as said front and rear guide engaging means aresimultaneously in engagement with said horizontal and arcuate guidemeans.

4. In a grinding machine for shear blades or the like, a grinding meanshaving a circumferential peripheral grinding surface, a frame includinga pair of transversely spaced longitudinally extending side plates,conveyer carrying wheels mounted at the ends of said frame, drive meanshaving driving connection with-at least one of said wheels, an endlessconveyer carried by said wheels and driven beneath said grinding meansand including a series of successively arranged blade carriers, guidemeans supported on said side plates at each side of said conveyer forsupporting and guiding the upper longitudinal traverse of said conveyerand including arcuate guide means in spaced relation to the grindingsurface of said grinding means for guiding said blade carriers in anarcuate path about said grinding surface, and guide means supported onsaid side plates at each sideof said conveyer for supporting and guidingthe lower traverse of said conveyer.

5. In a grinding machine for shear blades or the like, a grinding meanshaving a circumferential peripheral grinding surface, a frame includinga pair of transversely spaced longitudinally extending side plates,conveyer carrying wheels mounted at the ends of said frame, drive meanshaving driving connection with at least one of said wheels, an endlessconveyer carried by said wheels and driven beneath said grinding meansand including a series of successively arranged blade carriers, guidemeans supported on said side plates at each side of said conveyer forsupporting and guiding the upper longitudinal traverse of said conveyerand including vertically and angularly adjustable arcuate guide means inspaced relation to the grinding surface of said grinding means forguiding said blade carriers in an arcuate path about said grindingsurface, and guide means supported on said side plates at each side ofsaid conveyer for supporting and guiding the lower traverse of saidconveyer.

6. In a grinding machine for shear blades or the like, a grinding meanshaving a peripheral grinding surface. a co'nveyer ,,suitably supportedand driven beneath said, grinding; means and in.- cluding a series ofsuccessivelyjarranged blade carriers, each comprising a horizontal'bodymem.,- be and'a horizontal blade supporting member mounted for angularadjustment on said body member about a vertical axis.

7. In a grinding machine for shearblades, or the like, a grindingmeanshaving a peripheral grinding surface, a'conveyer suitably supported anddriven beneath said grinding means and including a series ofsuccessively arranged blade carriers, each comprising a body member, andblade positioning means having arecessed blade nesting rigid, portionand ablade handle sup; porting resilient portion. v In a grindingmachine for shear blades or theilike, a grinding means having a,peripheral grinding surface, 'a conveyer suitably supported and; drivenbeneath said grinding means and me cluding a series ofsuccessivelyarranged blade carriers, each comprising, a body member, andblade positioning means having a recessed blade nesting portion andaresilient blade handle sup: porting portion, and a clamp member mountedin said body member for movement into and out of clamping engagementwith the upper side of saidblade.

9. In a grinding machine for shear blades or the like, a grinding meanshaving a peripheral grinding surface, a conveyer suitably supported anddriven beneath said grinding means and including a series ofsuccessively arranged blade carriers, each comprising a body member, andblade positioning means having a recessed blade nesting portion and aresilient blade handle supporting portion, and a vertically yieldableclamp member mounted in said body member for movement into and out ofclamping engagement with the upper side of said blade.

16. In a grinding machine for shear blades or the like, a grinding meanshaving a peripheral grinding surface, a conveyer suitably supported anddriven beneath said grinding means and including a series ofsuccessively arranged blade carriers, each comprising. a body memberhaving blade supporting means in its upper side, a clamp memberpivotally mounted in said body member for swinging movement into and outof clamping relation with said blade and having limited axial movement,spring means arranged to impart downward axial movement to said clampmember, and cam means operative through the swinging movement of saidclamp member to impart upward axial'movement thereto.

11. In a grinding machine for shear blades or the like, a grinding meanshaving a peripheral grinding surface movable in a circumferentialgrinding path of a predetermined radius, a conveyer suitably supportedand driven in relation to said grinding means including a series ofsuccessively arranged blade carriers, guide means longitudinally at eachside of said grinding means for guiding said blade carriers into and outof relation therewith, and arcuate guide means in spaced relation tosaid peripheral grinding surface constructed and arranged to guide themovement of said blade carriers in an arcuate path about saidcircumferential grinding path to engage the blade surfaces to be groundwith said peripheral grinding surface and to move said surfaces in thesame circumferential grinding path therewith, and whereby the groundsurfaces of said blades are concavely ground in one direction upon aradius corre am de 121 spending to the predetermined radius of saidcircumferential grinding path.

' '12. The invention as defined in claim 11, further characterized byadjustable mounting means for said arcuate guide means constructed andarranged to place said guide means in eccentric relation to saidperipheral grinding surface'whereby the path of movement of said bladecarriers converges toward said peripheral grinding surface from one endto the other of said guide means.

'13. In 'a grinding machine for shear blades or the like, a grindingmeans having a peripheral grinding surface movable in a circumferentialgrinding path of a predetermined radius and said grinding surface havinga predetermined transverse'grinding contour, a conveyer suitablysupported and driven in relation to said grinding means including aseries of successively arranged blade carriers, guide meanslongitudinally at each side of said grinding means fforguiding saidblade carriers into and out of relation therewith, and arcuate guidemeans in spaced relation to said peripheral grinding surface constructedand arranged to guide the movement of said blade carriers in an arcuatepath about said circumferential grinding path to engage the blade surefaces to be ground with said :peripheralgrindin surface and to movesaid-surfaces in the same c'ir cumferential grinding path therewith. andwhereby the ground surfaces of said blades are concavely ground in onedirection upon a radius corresponding to the predetermined radius ofsaid circumferential grinding path and are ground in the other directionto conform to the predetermined transverse grinding contour of saidgrinding surface.

HENRY C. WHEELER.v

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